Ask Ausiello has posted a “Supernatural” spoiler.

Question: I’ll send you some birthday cake if you give me some Supernatural scoop about the 100th episode. —Annie
Ausiello: In the milestone episode, airing April 15,”a very important character will sacrifice themselves in a suicide mission,” reveals exec producer Sera Gamble. “We definitely kept in mind that this was [an important] episode. We wanted to deliver something with real scope; it’s about the Archangel Michael. Crises will come to a head for Dean and Castiel. And you’ll see characters you never thought you’d see again.”